Electrical pump control for water systems



y 8, 1934- D. D. HESTER 1,957,595

ELECTRICAL PUMP CONTROL FOR WATER SYSTEMS Filed Oct. 6, 1933 2 Sheets-Sheet l L, Inventor J Q. #6 'fer y 1934. D. D. HESTER 1,957,595

ELECTRICAL PUMP CONTROL FOR WATER SYSTEMS Filed Oct. 6, 1933 2 SheetsSheet 2 Z0 J2 Z5" d) 29 I nventor Patented May 8, 1934 UNITED STATES PATENT OFFICE ELECTRICAL PUMP CONTROL FOR WATER SYSTEMS Application October 6, 1933, Serial No. 692,548

1 Claim.

This invention appertains to new and useful improvements in electrical control means for pumps, the principal object of the invention being to provide a water pressure controlled switch through the agency of which a pump motor can be energized for supplying hot water in a hot water system to the consumer, as required.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:-

Figure 1 represents a diagrammatic view disclosing the electrical connections between the electrical devices involved and in conjunction with the conduits of the system.

Figure 2 represents a fragmentary vertical sectional view through a portion of the tank shown in Figure 1 and through the switch mechanism.

Figure 3 represents a horizontal sectional view 20 through the switch mechanism, taken substantially on the line 33 of Figure 2.

Referring to the drawings wherein like numerals designate like parts, it can be seen in Figure 1 that numeral 5 represents the hot water tank, while numeral 6 represents the hot water heater, with the pipes 7, 8, 9 and 10 forming a circuit with the tank 5 and heater 6 in which water is heated as it circulates along this route.

Numeral 11 represents the hot water supply pipe, while numeral 12 represents the water return line for the system which is returned to the heating circuit by means of a centrifugal pump 13. The electrical means for controlling this pump is generally referred to by numeral 14 and as is shown in Figure 2, consists of the vertically disposed barrel 15 having the city water supply line 16 connected thereto adjacent its top, While at the bottom, the lower portion of the barrel is encased by the shell 17, the bottom of the shell 40 having a threaded plug 18 adjustable therein, with an upstanding boss 19 thereon for normally supporting the piston 20 within the barrel 15 and sufficiently spaced above the bottom of the shell 17. The barrel 15, at a portion thereof within the shell 17 and above the piston 20, is provided with perforations 21 so that water entering the barrel 15 from the supply line 16 can pass into the shell 17 by way of the openings 21 and out through the pipe 22. This pipe 22 has the valve 23 therein and extends into the tank 5, as shown in Figure 1. The end of the pipe 22, within the tank 5, is bent downwardly and terminates adjacent the bottom of the tank 5, as at 24.

A casing 25 is connected to the top of the barrel 15 by a tubular connection 26 and through this is slidable the rod 27 upstanding from the said piston 20. A cross pin 28 on this rod 27 limits the upward movement of the rod, the upper end of the rod, within the casing 25, being provided with a head 29 which is capable of striking against the switch arm 30 to throw the contact bar 31 against the contacts 3233. A spring 34 serves to normally throw the switch arm 30 to the lowered position shown in Figure 2, so that the T- member 35 will rest against the pair of parallel and spaced cross bars 36-36 located within the casing 25.

Referring to Figure 1, it can be seen that numeral 36 represents the current supply line to the switch mechanism, while numeral 37 represents the connection between this switch and the motor 38 of the centrifugal pump 13, while wires 39 can extend from this switch to the lamp or other indicating means near the clerks desk, when this system is used in a hotel, so that in the event the signal is operated over an unusual period of time, the clerk can inquire.

Obviously, as water is drawn from the system by the user, water feeds into the system by way of the city supply line 16. As the water enters the system, the piston 20 is elevated so as to actuate the switch shown in Figure 2, which results in the energization of the motor driven pump 13. The operation of the pump, of course, returns the water of return line 12 to the tank 5 and the heating circuit heretofore described.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

In a hot water system, a heating circuit including a reservoir and a heater unit and conduits connecting same, an outlet for the circuit, an inlet for the heating circuit, a return line from the system, a motor driven pump between the return line and the reservoir, a water supply line under pressure, a switch for controlling the pump, and water pressure responsive piston in the water supply line whereby the said switch is actuated when water is drawn from the said heating circuit and water accepted from the supply line.

DEWEY DUGAS HESTER. 

